SU1129562A1 - Pulse device for registering distribution of magnetic field strength in material - Google Patents

Abstract

PULSE DEVICE FOR REGISTRATION OF DISTRIBUTION tensions, carry electrical field in the material, comprising a generator of rectangular pulses, connected with terminals for connecting the sample located on the coordinate table, a capacitive probe connected to an input of the amplifier, and biaxial registratorg distinguishing so .chto , in order to improve the accuracy and speed of measurements, a subtractive device was introduced into it, the first input of which is connected to the output of the amplifier, the second - to the output of the triggering generator, Turning to the output of a generator of rectangular pulses, and the output - to the first input XY recorder, a second input of which is connected to the I output of transducer coordinate table.

Description

The invention relates to a measurement technique and can be used to measure the distribution of the electrophysical parameters of conductive materials. Devices are known for determining the distribution of the electric field intensity in semiconductors, containing an electron gun or a laser, a system providing scanning of an electron or laser beam, recording equipment, a power source, based on the fact that the concentration of locally generated nonequilibrium electron-hole pairs is functionally connected The electric field strength at the point of generation, ij. The disadvantage of the known devices is the low measurement accuracy caused by the disturbed material The closest to the present invention is a pulsed device for detecting the distribution of the electric field intensity in the material, containing a square arc pulse generator connected to terminals for connecting a sample located on a coordinate table with a capacitance probe connected to the amplifier input , and two-coordinate recorder 2. However, this device does not contain technical means for differentiating the obtained result by coordinate, and the graphic lasing is characterized by low accuracy and is associated with a lot of time, the purpose of the invention is to improve the accuracy and speed of measurements. The goal is achieved by the fact that a pulse device for detecting the distribution of the electric field intensity in the material, containing a generator of square impulses connected to the terminals for connecting a sample located on the coordinate table, a capacitive probe connected to the amplifier input, and a two-coordinate recorder, a subtractive device is introduced, the first input of which is connected to the output of the amplifier, the second input is connected to the output of the trigger generator connected to the output of the rectangular generator pulses, and the output is connected to the first input of a two-coordinate recorder, the second input of which is connected to the output of the coordinate displacement transducer. The drawing shows the functional diagram of the device. The device contains a generator of 1 rectangular pulses connected to the terminals for connecting the sample 2 of the material located on the coordinate table 3, a capacitive probe 4 located in the immediate vicinity of sample 2 and connected to the input of the amplifier 5, the output of which is connected to the first input of the subtractor devices b. The second input of the subtractor device b is connected to the output of the starting generator 7 connected to the generator 1 of rectangular pulses. The output of the subtracting device 6 is connected to the first input of the two-coordinate recorder 8, the second input of which is connected to the output of the transducer 9 of the movement of the coordinate table. The device works as follows. From the generator 1 of rectangular pulses, the investigated sample 2 is fed with a frequency CO and a duration t of rectangular pulses. The frequency and duration of the pulses are chosen so that the stationary distribution of the electric field would be established in the material, and during the time between the pulses the system would return to its original state. Coordinate table 3 together with test sample 2 fixed on it moves with a certain constant velocity V relative to the capacitance probe 4. By the time the next pulse arrives on the test material, as a result of which the same electric field distribution is established in the material each time at different points of the material under study, equidistant from each other by a distance which is equal to the relative displacement of the probe. moving at the speed of the material over the time interval between pulses T 1 / s. The output of the amplifier .5. impulses of duration i are formed. the following with frequency ω, with the amplitude of each proportional to the magnitude of the electric potential of a point of material; in which was the capacitive probe 4. at the time of arrival of the next pulse to the sample. The pulses of the amplifier are fed to the input of the subtractor, which gives the difference between the amplitudes between each previous pulse and the next after it. Starting generator 7 inputs start impulses with (Adjustable duration and delay synchronously with pulses generated by square pulse generator 1) to the input of subtractor 6. The resulting difference in amplitudes of each successive and previous pulses goes to the first input of a two-coordinate recorder,

3 1129562

the second input of which enters the signal probe during its movement from the linear transducer 9 with respect to the investigated displacement of the coordinate table 3, the material, and the distance between the exact materials fixed on it - the measuring base -

for a capacitive probe, take an arbitrarily small way /

electrical signal. 5 reducing the speed of V and increasing

Thus, the device permits the frequency O, while it conducts with great accuracy and small differences in electrical potentias of time to record the differences of points related to the distance

the electrical potential between the points, the closer to the value

Do each adjacent points in the ma-10 intensity of the electric field,

The material through which we pass - the smaller the distance between the points.

Claims (1)

PULSE DEVICE FOR REGISTRATION OF VOLTAGE DISTRIBUTION- _: ELECTRICAL FIELD LINES IN MATERIAL, containing a rectangular pulse generator connected to the terminals for connecting a sample located on the * coordinate table, a capacitive probe connected to the amplifier input, and a two-coordinate recorder, which distinguishes with the aim of increasing accuracy and measurement performance, a subtracting device is introduced into it, the first input of which is connected to the output of the amplifier, the second to the output of the starting generator connected to the output of the square-wave generator, and the output to vym input XY recorder, a second input of which I is connected to the output of the transducer displacement coordinate table.